Data storage device demodulating servo burst by computing slope of intermediate integration points

摘要

A data storage device is disclosed comprising a head actuated over a disk surface comprising tracks defined by servo sectors, wherein each servo sector comprises at least one servo burst comprising a periodic pattern. The servo burst of one of the servo sectors is read to generate a read signal, and M intermediate integration points yNi are computed according to:;yNi=∑k=0Ni⁢r⁡(k⁢⁢Ts)·sin⁡(ω⁢⁢k⁢⁢Ts);i=0,1,…⁢,M-1
where r(kTs) represents a sample point of the read signal, Ts represents a sample interval between the sample points, and ω represents a frequency of the periodic pattern in the servo burst.

主权项

1. A data storage device comprising:
a disk surface comprising tracks defined by servo sectors, wherein each servo sector comprises at least one servo burst comprising a periodic pattern; a head actuated over the disk surface; and control circuitry configured to:
read the servo burst of one of the servo sectors to generate a read signal; andcompute M intermediate integration points yNi according to:yNi=∑k=0Ni⁢r⁡(k⁢⁢Ts)·sin⁡(ω⁢⁢k⁢⁢Ts);i=0,1,…⁢,M-1 where:r(kTs) represents a sample point of the read signal;Ts represents a sample interval between the sample points; andω represents a frequency of the periodic pattern in the servo burst.